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There are two types of leash aggression.The first is when a dog is more aggressive when he's on a leash, but happy off it. This is generally because he feels restrained by the leash and doesn't have the power to leave if he wants to, and so he's aggressive to keep other dogs back from him.
The second type is your type: dogs who are aggressive to other dogs on leashes. I'm not too sure why this happens, but it does. What you need to do is teach your dog that a leashed dog approaching is a good thing. Say away from punishments, tugs and "No"s when you see another dog approaching, this just reinforces in his mind that "another dog" = "bad things" and will likely make him worse. Instead, go somewhere where there's a few leashed dogs but not many. Take a huge big pile of treats (it's probably best not to feed your dog before hand so he's hungry). Sit somewhere out of the way, so dogs will be passing but not too close. Keep your dog on a leash. As soon as you see another dog start stuffing treats into your dogs mouth. As soon as the dog has passed, stop giving out treats. Repeat for several days anytime you see another dog (you may want to cut down on his meals for a bit )
You should start getting to the point where your dog automatically looks for his treats when another dog approaches. At this point you can slow the rate of reinforcement, so try a treat every few seconds, rather than constantly. As he gets better and better at passing other dogs, ignoring them and eating his treats, you ca slow down the treat flow even more until he's just getting one or two for passing other dogs. If he starts reacting to other dogs again up the rate of reinforcement again.You need to kep you more interesting than the other dogs.
Work slowly, start with the other dogs far away and slowly work them closer. Stay relaxed, if you tense up so will he. And don't expect an instant fix, there's no such thing in dog training.